pre-processing has a single question of this writing. Is this tag useful?
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\$\begingroup\$ I've removed all occurrences of this tag. \$\endgroup\$ – Josh♦ Feb 17 '16 at 17:25
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I don't think this is a useful tag at all. Preprocessing is a type of solution, not a specific problem or solution per se. One is not an expert in "preprocessing things" in general, one is an expert at some particular task done with or during pre-processing, and in those cases the more specific tag related to that task should be used.
I think we should blacklist this tag.
